Author(s): Sevket Cokgor; Serhat Kucukali
Linked Author(s): Serhat Kucukali
Keywords: Emergent vegetation; Turbulence intensities; Vegetation density; Bottom roughness
Abstract: Turbulence characteristics were studied in this work in/around vegetation zone for various vegetation densities, flow conditions and different bed roughness in the laboratory re- circulating flume. Vegetation zone was realized with natural circular sedges that replaced in the observation section of the flume. Velocity measurements were achieved by Nortek 10 MHz Acoustic Doppler. Turbulence intensities (u’, v’) that RMS values fluctuating components of the velocities at stream wise and vertical directions were determined upstream, downstream and in the vegetation zone. Shear stress distribution by depth also was focused about the stiffness of the vegetation. Experimental results were indicated high vegetation density generated the grid in the flow that caused turbulence characteristic in the vegetation greater than the upstream and downstream part of it. Reducing of the vegetation density was caused to reducing of the turbulence intensities in the vegetation even more than upstream and downstream part of the vegetation zone by causing fine sediment settlement in that zone.
Year: 2005